Year	constant 2015 US$
1970	17850.86419048447
1971	18444.86451814971
1972	19153.46581672325
1973	19915.08178591496
1974	19855.015749027614
1975	19892.122371620822
1976	20901.881973447038
1977	21608.288213324573
1978	22541.8440234619
1979	23194.308954656924
1980	23105.900738113975
1981	22794.940041048485
1982	22788.715431158904
1983	23364.780527869963
1984	24085.42442131881
1985	24730.441676318707
1986	25985.24994653011
1987	26513.46369739045
1988	27501.434894500682
1989	28181.23107228737
1990	29465.71802137916
1991	30366.250862417568
1992	31039.000096222844
1993	30659.022305717972
1994	31218.85678224576
1995	31763.75152771345
1996	31949.192501819736
1997	32282.77065890462
1998	32972.12724186481
1999	33589.242587458095
2000	34142.846508749564
2001	34609.05140767029
2002	34531.63576114217
2003	34457.04331617581
2004	35434.781655656705
2005	35591.601841343654
2006	37082.98970813747
2007	38193.31941074989
2008	38184.88002602223
2009	37078.818205628544
2010	38297.955665038666
2011	40354.68418650034
2012	40367.15350813055
2013	40520.984948232326
2014	41289.55918536815
2015	42039.95018017986
2016	42965.45962416766
2017	43759.65052479411
2018	44302.96510582299
2019	44936.35495848677
2020	43091.28051271187
2021	44365.68875335252
2022	43878.04343158886
2023	44177.84073076872